<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
     <script>
         var o = {
             id: 1,
             age: 19,
             msg: {
                name: 'eee'
             }
         }
         var obj = {};
        //  obj = o;
        // 浅拷贝此时会将原来的也改了
        //  obj.msg.name = 'ssss';

        // 浅拷贝
        Object.assign(obj, o);
        obj.msg.name = '33232'
        console.log(o);
     </script>   
</body>
</html>